Schneider Electric Industries Sas

Sylvie Lambardin

Simon Tian

The earth leakage protection device comprises an input designed to be connected to a measuring toroid, a comparator to compare a signal representative of an earth leakage current with a reference threshold, and a processing circuit to command a trip relay for opening main contacts when an earth leakage fault is detected. The device also comprises a signal rectifier receiving at least one signal representative of an earth leakage current, and a filter connected to the rectifier to supply a filtered rectified signal to said comparison means. The electrical switchgear unit comprises main conductors and contacts connected in series, the measuring toroid of the earth leakage current, the relay, and an earth leakage protection device with a matching filter connected to the toroid and to the trip relay.

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Chatenoy le Royal, France

Sylvie Lambardin